valueErrorBar

Error bars are used on charts to indicate an error or an uncertainty in a reported measurement. They give a general idea of how precise a measurement is.

In PolarChart, an error bar is a vertical bar with two marks at its edges. An error bar accompanies a series point. Error bars can be generated either from concrete or calculated values. To generate one error bar, two values, high and low, are needed. If the data source of your chart provides concrete high and low values, assign the required data source fields to the highValueField and lowValueField options.

Alternatively, you can calculate the high and low error bar values automatically. For this purpose, choose one of error bar types and specify the value to be used in calculation.

displayMode

Usually, when displaying error bars, you need both the lower and higher parts of them to indicate the error. This case corresponds to the displayMode option equaling 'auto'. If you need to display the lower or higher parts separately, set this option to 'low' or 'high' respectively. To hide error bars, assign 'none' to this option.

When using the widget as an ASP.NET MVC Control, specify this option using the ValueErrorBarDisplayMode enum. This enum accepts the following values: Auto, Low, High and None.

highValueField

If you need to generate error bars from concrete values, specify the highValueField option with the name of the field that provides them. These values will be displayed on a chart as the higher end of error bars. To provide data for the lower end of error bars, specify the lowValueField option.

NOTE

If you generate error bars from concrete values, do not specify the valueErrorBar.type option.

lineWidth

lowValueField

If you need to generate error bars from concrete values, specify the lowValueField option with the name of the field that provides them. These values will be displayed on a chart as the lower end of error bars. To provide data for the higher end of error bars, specify the highValueField option.

NOTE

If you generate error bars from concrete values, do not specify the valueErrorBar.type option.

type

Depending on the type of errors you need to visualize, use the error bars of one of the following types.

percent
Defines the confidential interval in percentages. Error bar values are calculated as a percentage of the series point value. The percentage value is determined by the value option. The high and low error bar values are drawn symmetrically up and down from the series point.

stdError
For information on the standard error, refer to the article in Wikipedia.

stdDeviation
For information on the standard deviation, refer to the article in Wikipedia.

variance
For information on variance, refer to the article in Wikipedia.

fixed
Defines the confidential interval in constant values. Error bar values are determined by the value option. The high and low error bar values are drawn symmetrically up and down from the series point.

When using the widget as an ASP.NET MVC Control, specify this option using the ValueErrorBarType enum. This enum accepts the following values: Percent, StdError, StdDeviation, Variance and Fixed.